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14.2. Input/Output Pins and External Connections
14.2.1. List of Input/Output Pins
Table 14.2.1.1 lists the SPIA pins.
Pin name
SDIn
SDOn
O or Hi-Z
SPICLKn
#SPISSn
If the port is shared with the SPIA pin and other functions, the SPIA input/output function must be
assigned to the port before activating SPIA. For more information, refer to the "I/O Ports" chapter.
14.2.2. External Connections
SPIA operates in master mode or slave mode. Figures 14.2.2.1 and 14.2.2.2 show connection diagrams
between SPIA in each mode and external SPI devices.
S1C31 SPIA (master mode)
Figure 14.2.2.1 Connections between SPIA in Master Mode and External SPI Slave Devices
S1C31 SPIA (slave mode)
External SPI slave devices
Figure 14.2.2.2 Connections between SPIA in Slave Mode and External SPI Master Device
14-2
Table 14.2.1.1 List of SPIA Pins
I/O*
Initial status*
I
I (Hi-Z)
Hi-Z
I or O
I (Hi-Z)
I
I (Hi-Z)
USINn
V
DD
V
SS
USOUTn
V
SS
USOUTn
#SPISSn
SDOn
SDIn
SPICLKn
#SPISS
SDO
SDI
SPICLK
#SPISS
SDO
SDI
SPICLK
Seiko Epson Corporation
Function
SPIA Ch.n data input pin
SPIA Ch.n data output pin
SPIA Ch.n external clock input/output pin
SPIA Ch.n slave select signal input pin
* Indicates the status when the pin is configured for SPIA.
#SPISS
SDO
SDI
SPICLK
#SPISS
SDO
External SPI slave devices
SDI
SPICLK
#SPISS
SDO
SDI
SPICLK
#SPISS0
#SPISS1
#SPISS2
External SPI master device
SDI
SDO
SPICLK
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
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